<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <Header :addTodoList="addTodoList" />
      <List
        :todoList="todoList"
        :changeDoneById="changeDoneById"
        :singleDeleteById="singleDeleteById"
      />
      <Footer
        :todoList="todoList"
        :selectAllOrNo="selectAllOrNo"
        :deleteIsComplete="deleteIsComplete"
      />
    </div>
  </div>
</template>

<script>
import Header from "@/components/Herder";
import List from "@/components/List";
import Footer from "@/components/Footer";

export default {
  name: "App",
  components: {
    Header,
    List,
    Footer,
  },
  data() {
    return {
      todoList: JSON.parse(localStorage.getItem("todoList") || "[]"),
    };
  },
  methods: {
    // 增
    addTodoList(todoItem) {
      this.todoList.unshift(todoItem);
    },
    // 根据 id 选中
    changeDoneById(id, done) {
      // map 返回一个新数组
      this.todoList = this.todoList.map((item) =>
        item.id === id ? { ...item, done } : item
      );
    },
    // 根据 id 删除
    singleDeleteById(id) {
      // filter 返回一个新数组
      this.todoList = this.todoList.filter((item) => item.id !== id);
    },
    // 全选/反选
    selectAllOrNo(done) {
      this.todoList = this.todoList.map((item) => ({ ...item, done }));
    },
    // 删除已完成
    deleteIsComplete() {
      this.todoList = this.todoList.filter((item) => !item.done);
    },
  },
  watch: {
    todoList: {
      deep: true,
      handler(newValue) {
        localStorage.setItem("todoList", JSON.stringify(newValue));
      },
    },
  },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>